diff --git a/composer.json b/composer.json
index 23b500b..4cbdfa8 100644
--- a/composer.json
+++ b/composer.json
@@ -34,6 +34,7 @@
     "ext-mbstring": "*",
     "ext-openssl": "*",
     "guzzlehttp/guzzle": "^7.9.2",
+    "psr/log": "^2.0|^3.0",
     "spomky-labs/base64url": "^2.0.4",
     "symfony/polyfill-php83": "^1.33",
     "web-token/jwt-library": "^3.4.9|^4.0.6"
diff --git a/src/Utils.php b/src/Utils.php
index 195f585..ab6c2ba 100644
--- a/src/Utils.php
+++ b/src/Utils.php
@@ -13,6 +13,7 @@
 use Base64Url\Base64Url;
 use Jose\Component\Core\JWK;
 use Jose\Component\Core\Util\Ecc\PublicKey;
+use Psr\Log\LoggerInterface;
 
 class Utils
 {
@@ -55,17 +56,31 @@ public static function unserializePublicKey(string $data): array
         ];
     }
 
+    private static function logWarning(string $message, ?LoggerInterface $logger): void
+    {
+        $logger !== null
+            ? $logger->warning($message)
+            : trigger_error($message, E_USER_WARNING);
+    }
+
+    private static function logNotice(string $message, ?LoggerInterface $logger): void
+    {
+        $logger !== null
+            ? $logger->notice($message)
+            : trigger_error($message, E_USER_NOTICE);
+    }
+
     /**
      * Generates user warning/notice if some requirements are not met.
      * Does not throw exception to allow unusual or polyfill environments.
      */
-    public static function checkRequirement(): void
+    public static function checkRequirement(?LoggerInterface $logger = null): void
     {
-        self::checkRequirementExtension();
-        self::checkRequirementKeyCipherHash();
+        self::checkRequirementExtension($logger);
+        self::checkRequirementKeyCipherHash($logger);
     }
 
-    public static function checkRequirementExtension(): void
+    public static function checkRequirementExtension(?LoggerInterface $logger = null): void
     {
         $requiredExtensions = [
             'curl'     => '[WebPush] curl extension is not loaded but is required. You can fix this in your php.ini.',
@@ -74,17 +89,17 @@ public static function checkRequirementExtension(): void
         ];
         foreach ($requiredExtensions as $extension => $message) {
             if (!extension_loaded($extension)) {
-                trigger_error($message, E_USER_WARNING);
+                self::logWarning($message, $logger);
             }
         }
 
         // Check optional extensions.
         if (!extension_loaded('bcmath') && !extension_loaded('gmp')) {
-            trigger_error('It is highly recommended to install the GMP or BCMath extension to speed up calculations. The fastest available calculator implementation will be automatically selected at runtime.', E_USER_NOTICE);
+            self::logNotice('It is highly recommended to install the GMP or BCMath extension to speed up calculations. The fastest available calculator implementation will be automatically selected at runtime.', $logger);
         }
     }
 
-    public static function checkRequirementKeyCipherHash(): void
+    public static function checkRequirementKeyCipherHash(?LoggerInterface $logger = null): void
     {
         // Print your current openssl version with: OPENSSL_VERSION_TEXT
         // Check for outdated openssl without EC support.
@@ -93,11 +108,11 @@ public static function checkRequirementKeyCipherHash(): void
         ];
         $availableCurves = openssl_get_curve_names();
         if ($availableCurves === false) {
-            trigger_error('[WebPush] Openssl does not support curves.', E_USER_WARNING);
+            self::logWarning('[WebPush] Openssl does not support curves.', $logger);
         } else {
             foreach ($requiredCurves as $curve => $message) {
                 if (!in_array($curve, $availableCurves, true)) {
-                    trigger_error($message, E_USER_WARNING);
+                    self::logWarning($message, $logger);
                 }
             }
         }
@@ -109,7 +124,7 @@ public static function checkRequirementKeyCipherHash(): void
         $availableCiphers = openssl_get_cipher_methods();
         foreach ($requiredCiphers as $cipher => $message) {
             if (!in_array($cipher, $availableCiphers, true)) {
-                trigger_error($message, E_USER_WARNING);
+                self::logWarning($message, $logger);
             }
         }
 
@@ -120,7 +135,7 @@ public static function checkRequirementKeyCipherHash(): void
         $availableHash = hash_hmac_algos();
         foreach ($requiredHash as $hash => $message) {
             if (!in_array($hash, $availableHash, true)) {
-                trigger_error($message, E_USER_WARNING);
+                self::logWarning($message, $logger);
             }
         }
     }
diff --git a/src/WebPush.php b/src/WebPush.php
index 2f338e4..0fdb794 100644
--- a/src/WebPush.php
+++ b/src/WebPush.php
@@ -18,11 +18,13 @@
 use GuzzleHttp\Psr7\Request;
 use Psr\Http\Message\RequestInterface;
 use Psr\Http\Message\ResponseInterface;
+use Psr\Log\LoggerInterface;
 
 class WebPush
 {
     protected Client $client;
     protected array $auth;
+    protected ?LoggerInterface $logger;
 
     /**
      * @var null|array Array of array of Notifications
@@ -52,15 +54,23 @@ class WebPush
     /**
      * WebPush constructor.
      *
-     * @param array    $auth           Some servers need authentication
-     * @param array    $defaultOptions TTL, urgency, topic, batchSize, requestConcurrency
-     * @param int|null $timeout        Timeout of POST request
+     * @param array           $auth           Some servers need authentication
+     * @param array           $defaultOptions TTL, urgency, topic, batchSize, requestConcurrency
+     * @param int|null        $timeout        Timeout of POST request
+     * @param LoggerInterface|null $logger    Optional PSR-3 logger; if provided, replaces trigger_error() calls
      *
      * @throws \ErrorException
      */
-    public function __construct(array $auth = [], array $defaultOptions = [], ?int $timeout = 30, array $clientOptions = [])
-    {
-        Utils::checkRequirement();
+    public function __construct(
+        array $auth = [],
+        array $defaultOptions = [],
+        ?int $timeout = 30,
+        array $clientOptions = [],
+        ?LoggerInterface $logger = null
+    ) {
+        $this->logger = $logger;
+
+        Utils::checkRequirement($this->logger);
 
         if (isset($auth['VAPID'])) {
             $auth['VAPID'] = VAPID::validate($auth['VAPID']);